空间钢框架结构的简化柱梁模型及其弹塑性动力分析

The simplified column-beam frame model of spacial steel frames and elastic-plastic dynamic analysis

高层钢结构本身构件众多,又要考虑材料非线性和几何非线性等因素影响,使得计算非常复杂,这样就非常有必要对其进行简化。多质点系剪切模型在多层平面框架的抗震分析中已得到了广泛的应用,但这种模型不能考虑钢框架结构梁柱的强度比和刚度比、节点域变形、柱附加轴力引起的弯曲变形和梁间塑性铰对地震响应的影响。本文介绍的简化柱梁模型考虑以上因素,对高层平面钢框架结构和空间结构进行了有效的简化,并进行了钢框架的二阶弹塑性动力分析。

The development of tall buildings at very fast speed make structures complex daily, moreover we must consider the effects of a lot of factors. It causes the computation of structures quite complex, so we should simplify it reasonably and effectively. The conventional model which has been generally used for seismic response analysis is equivalent multi-mass shear vibration system, but this model can not consider that the strength and the stiffness ratio of the beam-to-column, the deformation of joint panel, additional axial force and plastic hinge in the middle of the beam influence on seismic response. The simplified column-beam frame model presented in this paper not only considers the former factors but also simplifies the high rise planar steel frame, planar double system and space structure effectively. So it is well applied to the second-order elastic-plastic dynamic analysis of steel frame.